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11-25-2015, 08:54 PM
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#1
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Rivet Master
1979 31' Sovereign
Northeastern
, Kentucky
Join Date: Feb 2011
Posts: 627
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Accumulator
I installed one of those shurflo accumulators to go with my PAR water pump. I can't tell much difference other than the water pump will run for about 3-4 secs, then pause for about a second, and then run for 3-4 more seconds, etc. Before it would cycle on and off about every second or two. Is this all it's suppose to do? I guess I was expecting more water flow without the pump running.
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11-25-2015, 09:10 PM
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#2
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Rivet Master
2012 25' Flying Cloud
Battle Lake
, Minnesota
Join Date: Jun 2009
Posts: 7,714
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It's greatest use is to take up thermal expansion in the water system and prevent leaks and possibly damage to connections. It also functions as a shock absorber smoothing the operation of the system.
To have a large supply of water without the pump running frequently you would need a much larger accumulator. The pump would then run less but much longer. I've thought about it but our little Shuflo works well enough.
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Doug and Cheryl
2012 FC RB, Michelin 16, ProPride 1400
2016 Ram 1500 Laramie Crew Cab 4X4 Ecodiesel 3.92 axles
The Truth is More Important Than the Facts
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11-25-2015, 09:38 PM
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#3
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Rivet Master
1994 30' Excella
alexandria
, Kentucky
Join Date: Aug 2004
Posts: 2,323
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Have you adjusted the air pressure in the accumulator?
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Steve, Christy, Anna and Phoebe (Border Collie)
1994 Classic 30'11" Excella - rear twin
2009 Dodge 2500, 6 Speed Auto, CTD, Quad Cab, Short Bed
Hensley Arrow hitch with adjustable stinger
WBCCI # 3072
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11-25-2015, 09:42 PM
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#4
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Figment of My Imagination
2012 Interstate Coach
From All Over
, More Than Anywhere Else
Join Date: Dec 2011
Posts: 10,868
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Quote:
Originally Posted by KYAirstream
I installed one of those shurflo accumulators to go with my PAR water pump. I can't tell much difference other than the water pump will run for about 3-4 secs, then pause for about a second, and then run for 3-4 more seconds, etc. Before it would cycle on and off about every second or two. Is this all it's suppose to do? I guess I was expecting more water flow without the pump running.
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An accumulator is merely a reservoir with an air bladder that can be compressed when water pressure is applied and expand when water pressure is released. When your system is operating at a relatively high pressure you have a very fast flow of water through an open faucet, and as soon as you shut off the faucet, the pressure builds up in the plumbing. In extreme cases, you can experience "water hammer" which is a noise carried through rigid plumbing as the pressure is instantly applied. The air bladder in an accumulator allows the pressure to be applied more gradually and quietly.
An accumulator will make little difference in how your pump runs, and in fact it will be more useful when you're hooked up to a relatively high-pressure municipal system, not when you're pumping from your fresh tank.
On a related issue, an accumulator is more useful if you have rigid plumbing— PVC or copper— than if you have the more flexible PEX.
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I thought getting old would take longer!
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11-25-2015, 10:01 PM
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#5
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Rivet Master
2007 22' International CCD
Corona
, California
Join Date: Jul 2013
Posts: 9,180
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If you don't use the standard Atwood water heater, like we do, an accumulator is kinda needed for a tankless water heater. The pump short cycles and makes a lot more noise when the accumulator or an air bubble in the Atwood is not there. The nice thing about the accumulator tank is that you don't lose the trapped air bubble.
Sent from my pocket Internet using Airstream Forums
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Rich, KE4GNK/AE, Overkill Engineering Dept.
'The Silver HamShack' ('07 International 22FB CCD 75th Anniversary)
Multiple Yaesu Ham Radios inside and many antennae sprouting from roof, ProPride hitch, Prodigy P2 controller.
2012 shortbed CrewMax 4x4 Toyota Tacoma TV with more antennae on it.
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11-25-2015, 11:31 PM
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#6
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3 Rivet Member
2011 27 FB International
Vancouver
, British Columbia
Join Date: Aug 2014
Posts: 228
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I find it most useful simply to prevent leaks from pressure changes during cold weather, which I was experiencing in various locations until I installed the accumulator. No leaks since.
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11-26-2015, 10:47 AM
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#7
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Rivet Master
1998 30' Excella 1000
Livingston
, Texas
Join Date: Jan 2014
Posts: 546
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Oh, and be careful of trying to get longer flow by upping the pressure charge. If I recall correctly, I think it was supposed to be 20 psi and I went to 30 psi, and busted the membrane.
If the pump cycling is really bothering you, and you have the space, there are somewhat larger (2 gallon) accumulators available.
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11-26-2015, 10:59 AM
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#8
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Rivet Master
2012 25' Flying Cloud
Battle Lake
, Minnesota
Join Date: Jun 2009
Posts: 7,714
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I think the Shurflo comes preloaded to 30 psi and that has worked well for us. Yes I can see how the membrane could break raising it too high, really no need to increase it that we have seen.
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Doug and Cheryl
2012 FC RB, Michelin 16, ProPride 1400
2016 Ram 1500 Laramie Crew Cab 4X4 Ecodiesel 3.92 axles
The Truth is More Important Than the Facts
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11-26-2015, 11:08 AM
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#9
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Rivet Master
1998 30' Excella 1000
Livingston
, Texas
Join Date: Jan 2014
Posts: 546
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You got me thinking about that so I checked. Your 30 psi is fine, according to Shurflo.
http://legacy.shurflo.com/pages/Food.../911-378-P.pdf
Maybe I had gone to 40 psi. Can't recall.
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11-26-2015, 11:11 AM
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#10
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Rivet Master
2012 25' Flying Cloud
Battle Lake
, Minnesota
Join Date: Jun 2009
Posts: 7,714
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Thanks for checking, I wasn't certain but good to know.
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Doug and Cheryl
2012 FC RB, Michelin 16, ProPride 1400
2016 Ram 1500 Laramie Crew Cab 4X4 Ecodiesel 3.92 axles
The Truth is More Important Than the Facts
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11-26-2015, 02:27 PM
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#11
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"Cloudsplitter"
2003 25' Classic
Houstatlantavegas
, Malebolgia
Join Date: Jun 2007
Posts: 20,000
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There is a stedfast limit as to how much I can accumulate.....
Bob
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I’m done with ‘adulting’…Let’s go find Bigfoot.
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11-27-2015, 08:31 PM
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#12
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Rivet Master
1979 31' Sovereign
Northeastern
, Kentucky
Join Date: Feb 2011
Posts: 627
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Quote:
Originally Posted by Protagonist
An accumulator will make little difference in how your pump runs, and in fact it will be more useful when you're hooked up to a relatively high-pressure municipal system, not when you're pumping from your fresh tank.
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My understanding from the manual is that the accumulator is installed right after the pump, which is a line separate from the city supply (in my case there is a check valve. ). So are you saying it should go in the supply line that both the pump and city supply share?
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11-27-2015, 08:34 PM
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#13
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Rivet Master
1979 31' Sovereign
Northeastern
, Kentucky
Join Date: Feb 2011
Posts: 627
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Quote:
Originally Posted by Siegmann
Oh, and be careful of trying to get longer flow by upping the pressure charge. If I recall correctly, I think it was supposed to be 20 psi and I went to 30 psi, and busted the membrane.
If the pump cycling is really bothering you, and you have the space, there are somewhat larger (2 gallon) accumulators available.
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Did you hear it bust when you applied too many PSI, or did it just stop operating as it did before?
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11-27-2015, 08:38 PM
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#14
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Figment of My Imagination
2012 Interstate Coach
From All Over
, More Than Anywhere Else
Join Date: Dec 2011
Posts: 10,868
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Quote:
Originally Posted by KYAirstream
So are you saying it should go in the supply line that both the pump and city supply share?
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It will work better that way, I think.
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I thought getting old would take longer!
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11-27-2015, 09:46 PM
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#15
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Rivet Master
1998 30' Excella 1000
Livingston
, Texas
Join Date: Jan 2014
Posts: 546
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Quote:
Originally Posted by KYAirstream
Did you hear it bust when you applied too many PSI, or did it just stop operating as it did before?
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No sound. Probably just a tear. When I removed the air hose, a little water came out of the air inlet fitting. Clearly got water on the wrong side of the bladder. Oh, and it did stop operating as it had before.
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01-01-2016, 07:30 PM
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#16
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2 Rivet Member
Oak Harbor
, wa
Join Date: Mar 2015
Posts: 76
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New year gift for our 2015 25 fc. Purchased a 2.1 gallon expansion tank/accumulator at home depot. Installed under sink in bathroom. Put a tee on accumulator, one leg goes to cold water supply line. Other leg goes to cold water at faucet. What a wonderful upgrade. Water at galley runs nearly 15 seconds before pump runs. We can flush the toilet 4 times without running the. Pump.
Yes the pump runs longer when it does run, but flow rate is very uniform.
Most importantly my wife loves the home- like water flow.
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01-01-2016, 10:30 PM
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#17
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Rivet Master
2007 30' Classic
Oswego
, Illinois
Join Date: Jul 2010
Posts: 13,669
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Quote:
Originally Posted by Stormalong
New year gift for our 2015 25 fc. Purchased a 2.1 gallon expansion tank/accumulator at home depot. Installed under sink in bathroom. Put a tee on accumulator, one leg goes to cold water supply line. Other leg goes to cold water at faucet. What a wonderful upgrade. Water at galley runs nearly 15 seconds before pump runs. We can flush the toilet 4 times without running the. Pump.
Yes the pump runs longer when it does run, but flow rate is very uniform.
Most importantly my wife loves the home- like water flow.
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I did this in my old sob, but it was a 1 gallon tank from grainger. Worked well, but that was an old single speed basic pump. I have never felt the need with the AS with the variable speed pump.
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"If the women don't find you handsome, they should at least find you handy." - Red Green
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